Narrowing searches based on url, author, date, and other attributes is also possible. For instance, the query [ Streisand sourcename:Techdirt ] restricts searches for "Streisand" to items from the blog "Techdirt".
Examples of other operators follow:

sourceurl:http://www.theverge.com/

items from the blog http://www.theverge.com/

sourcename:"New York"

items from blogs with "New York" in the name

date:10/20/11

items that appeared on 10/20/11

date:[10/1/11 TO 10/20/11]

items appearing between 10/1/11 and 10/20/11

author:"Bill Gates"

items by author "Bill Gates"

title:unsubstantiated

items with "unsubstantiated" in the title

body:"severely polluted"

items with "severely polluted" in the body

link:http://www.marco.org/2011/04/16/rumored-apple-hdtv

items linking to http://www.marco.org/2011/04/16/rumored-apple-hdtv

Note: all operators that take urls will accept simple domain names, which match any item at that domain, or complete item urls.

Safari is released to the world
— During the early development of Safari, I didn't just worry about leaking our secret project through Apple's IP address or our browser's user agent string. It also concerned me that curious gawkers on the outside would notice who I was hiring at Apple.

Keeping Safari a secret
— For much of the time we spent developing Safari — long before it was called by that name — it pretended to be Microsoft Internet Explorer. Specifically, Internet Explorer for Mac, which Apple had provided with the OS since 1998.

When I first heard the name “Safari”
— Ten years ago this month, my secret Web browser team at Apple became the “Safari” team — less than 30 days before we debuted the product on January 7, 2003. — To this day, I don't know who suggested the name “Safari.”